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介绍一种用于桥梁抗震的多球面滑动摩擦隔震支座,分析这种支座的设计原理,阐明其构造特点,分析了其工作机理和滑动隔震过程,并由此建立了该隔震支座的力—位移关系恢复力模型。理论分析表明,该支座除具备完善的减隔震支座所要求的功能之外,还构造简单、隔震机理清楚、数学物理模型明确,能够满足实际应用中简单性的要求。此外,该支座在不同强度的外部激励下,可以表现出不同的阻尼和刚度。并且具备单独优化性能,即该支座可以基于多性能目标或多水准地震,对于给定的桥梁隔震系统的各个参数分别进行优化。这两种特性使得该支座适合多水准地震动作用下,基于性能的隔震桥梁抗震设计。
This paper introduces a kind of multi-spherical sliding friction isolating bearing used for seismic response of bridges, analyzes the design principle of this kind of bearing, clarifies its structural characteristics, analyzes its working mechanism and sliding isolation process, and establishes the isolation Force - displacement relationship restoring force model of support. Theoretical analysis shows that this bearing has simple structure, clear isolation mechanism, clear mathematical mathematic model, and can meet the requirements of simplicity in practical application, besides having the required functions of reducing bearing. In addition, the pedestal can exhibit different damping and stiffness under different external stimuli. With separate optimization capabilities, the stand can be optimized for each parameter of a given bridge isolation system based on multi-performance targets or multi-level earthquakes. These two characteristics make the bearing suitable for the earthquake-resistant design of a performance-based seismic isolation bridge under multi-level ground motions.